# easy maths!!!

The difference between two numbers is 24. If twice the smaller number is subtracted from 3/4 of the greater number, the difference is 3. Find the greater number.

Bobby saved a fixed amount of money every day. He finds that the price of a model is \$70 more than his savings in 5 days or \$10 more than his savings in 9 days. How much does he save each day?

Donna buys some \$2 stamps and some \$5 stamps. If she spends %54 altogether and gets 15 stamps, how many \$2 stamps dpes she buy?

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• 最愛解答

1) Let x be the greater number and (x-24)be&am p;am p;nb sp;the smaller number

(3x/4) -2(x-24) = 3

3x - 8(x-24) = 12

3x - 8x + 192 =12

-5x = -180

x= 36

The greater number is 36.

2) Let \$x be the amount that he saves each day

5x +70 = 9x+10

4x = 60

x = 15

He saves \$15 each day.

3) Let the number of \$2stamps be x-stamps and number of \$5stamps be y-stamps.

x+y=15 ...(1)

2x+5y=54 ...(2)

(1) --- y=15-x ...(3)

Sub. (3) into (2)

2x+5(15-x)=54

2x+75-5x=54

-3x=-21

x=7

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